xt731z41sv9r https://exploreuk.uky.edu/dips/xt731z41sv9r/data/mets.xml   Kentucky Agricultural Experiment Station. 1953 journals 010 English Lexington : Agricultural Experiment Station, University of Kentucky Contact the Special Collections Research Center for information regarding rights and use of this collection. Kentucky Agricultural Experiment Station Progress report (Kentucky Agricultural Experiment Station) n.10 text Progress report (Kentucky Agricultural Experiment Station) n.10 1953 2014 true xt731z41sv9r section xt731z41sv9r Progress Report 10 April, 1953
KENTUCKY AGRICULTURAL EXPERIMENT STATION p
I Pennyrile Grain Testing Field
1952 Corn Performance Tests
The Pennyrile corn performance tests in 1952 were a continuation of the pro-
gram of the Pennyrile Grain Improvement Association in cooperation with the Ken-
tucky Agricultural Experiment Station. Results for the 1946-1951 tests were re-
ported in mimeograph form for those years.
Two comparative yield tests were grown as in previous years. One test was
composed of the hybrid varieties grown in several other locations in the state. It
included various commercial hybrids being grown extensively in the state and the
more promising experimental hybrids. The other test consisted of the commercial
hybrids being grown in this section of the state and two-open-pollinated varieties.
The performance of hybrids tested in previous years but not included in 1952 can
be obtained from, reports for previous years. The test on the effect of rate of
V planting was continued in 1952.
Experimental Procedure
.. A cover crop of lespedeza and weeds was turned under in the spring of 1952,
and-50Q pounds per acre of 4-12-8 fertilizer was applied before planting. The
entries in both tests were compared in 2 by 10 hill plots using a simple rand-
omized complete block design with 5 replications. The hill spacing was 42 inches
each way with 3 plants grown per hill. The corn was planted April 28th, thinned
to 3 stalks per hill May 30th and harvested September 29th.
Measures of Performance
1. Yields are recorded as bushels per acre of shelled grain at 15.5 percent
moisture. In both tests corrections were made for missing hills but not for minor
variation in stand.
2. Moisture at harvest. The percentage of moisture in the corn at harvest
was obtained by sampling 15-20 ears from each of two replications. The average
moisture percentages of the two replications sampled were used in calculating
the yields.
3. Broken stalks. The percentage of total broken stalks was determined by‘
making a count of the plants broken below the ear-bearing node and include those
broken because of corn·borer damage. Plants broken because of corn—borer
damage were determined by examining the plants for corn borer punctures or the
presence of frass. Percentage of plants erect is 100 minus the total percentage
of broken stalks.
4. _I:Iusk lengtim is recorded in inches of husk extension beyond the tip of
the ear. It is desirable that the ears be protected with husks that fit closely
around and over the tip of the ear and extend at least an inch or more beyond.
By J. F`. Shane and R. E. Anderson
Kentucky Agricultural Experiment Station
University of Kentucky
Lexin ton W

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difference between hybrids is found at the foot of each table. Unless the two
hybrids being compared differ by as much or more than the L. S. D. , little con-
fidence can be placed in the superiority of one over the other. Superior per- V
formance by a hybrid over a period of years is stronger evidence of real super-
iority than are the results in any one year. For this reason the period of years
results are much more reliable and should be used when selecting a hybrid for a
particular locality or purpose. ` __
The data for the uniform hybrid test are given in Table l and for the com- '
mercial hybrid te st in Table 2. The average yield in the uniform hybrid test was
31. 4 bushels per acre less than in 1951 and the average yield in the commercial
hybrid test was 27.1 bushels per acre less than in 1951.
Generally unfavorable growing conditions prevailed during the entire growing
season for corn and are reflected by these lowered average yields. A heavy local .
rain on July 4th prevented the even lower yields which were common in the
Pennyroyal area.
Uniform Hybrid Test
Results in 1952. The average yields of the white and yellow hybrids were
essentially the same. Four experimental white hybrids and three experimental
yellow hybrids were the highest yielding.
Several commercial hybrids also yielded very well. This group included the
white hybrids Broadbent 235W, US 523W and Stull 400W, and yellow hybrids
Ky 103, US 13, and Funk‘s G-91.
Long -term results. As noted previously, performance data based on several
years test are much more reliable than for any single year. Experimental hybrids
are dropped from the uniform test after one or two years if they do not show pro- ·
mise of superiority to the hybrids being recommended.
Thirty hybrids grown in the uniform test in 1951 were repeated in 1952; nine:
teen were tested for three years; thirteen were tested for four years; eight were
tested for five years, and six were texted for six and seven years.
Two year period. For the period 1951-1952 the white hybrids were higher
yielding than the yellow hybrids. CB 891lW, Stull 400W, US 523W, and Ky 9105B
were the highest yielding of the white hybrids. Ky 9107, Broadbent 235W, Ky 0105
and Ky 203 were also high yielding. There was no significant difference in yield